THE propensity for nudity by PETA (People for the Ethical Treatment of Animals) has backfired this time. A new anti-fur, anti-leather commercial starring Pamela Anderson as a scantily clad airport security guard who strips passengers of animal products is too racy for CNN Airport Network. PETA planned to debut the spot tomorrow at all three Gotham-area airports, and later this fall in the other 45 major airports serviced by CNN. But the network wrote to PETA saying it’s “particularly sensitive because children make up part of the demographic in airports.” PETA is now looking to run the ad — which also features Steve-O, Andy Dick, comic Carol Leifer and punk icon Nina Hagen — on in-flight entertainment.